/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.runtime.join;

/**
 * Join type for join.
 */
public enum FlinkJoinType {
	INNER, LEFT, RIGHT, FULL, SEMI, ANTI;

	public boolean isOuter() {
		switch (this) {
			case LEFT:
			case RIGHT:
			case FULL:
				return true;
			default:
				return false;
		}
	}

	public boolean isLeftOuter() {
		switch (this) {
			case LEFT:
			case FULL:
				return true;
			default:
				return false;
		}
	}

	public boolean isRightOuter() {
		switch (this) {
			case RIGHT:
			case FULL:
				return true;
			default:
				return false;
		}
	}

	@Override
	public String toString() {
		switch (this) {
			case INNER:
				return "InnerJoin";
			case LEFT:
				return "LeftOuterJoin";
			case RIGHT:
				return "RightOuterJoin";
			case FULL:
				return "FullOuterJoin";
			case SEMI:
				return "LeftSemiJoin";
			case ANTI:
				return "LeftAntiJoin";
			default:
				throw new IllegalArgumentException("Invalid join type: " + name());
		}
	}
}
